This last clause is telling us that Aventinus was buried in a forest that gave the Roman district its name….. but I'm not clear about the syntax and I can't get it to make sense:

is sepultus in eo colle [he is buried in that wood] qui nunc pars urbis Romae est nomen colli fecit [to translate literally word for word...which now part of the city of Rome is name to the wood gave] I can't understand what 'colli' [dative] is doing.. it seems circular. : he is buried in that wood which is now part of the city of Rome - ['nomen' is, I think, an accusative object...so what's its subject?] name to the wood gave. Or is it 'He is buried in that wood which, now part of the city of Rome, gave the wood its name' which is circular..?